Why does electronegativity decrease from right to left within a period?

N2__+3H2 = 2NH3 how many moles of hydrogen are consumed to produce 100. g of ammonia (17.04 g/mol)

An unknown mass of aluminum requires 6290 joules to raise the temperature from 23.9 C what is the mass of the aluminum?

If a chemical reaction such as the formation of iron oxide contains 4 atoms of iron (fe) in the product how many atoms of iron (fe) would be in the reactants?

Water is added to liquid isopropanol (a polar liquid) to form a solution of rubbing alcohol. Describe what happens on the molecular level as the water dissolves in the isopropanol.

The idea that atoms are neither gained nor lost during a chemical reaction is called the law of

Why must you wear safety glasses at all times

How do you classify solutions as acidic, basic, or neutral?

Which statements describe abiotic factors in an environment?

A ball rolling across the ground in Death Valley will slow and eventually stop. Why? - the ball's kinetic energy evaporates. - the ball's force is destroyed. - the friction of the ball changed the force to negative ions.

Calculate ∆h0 for the following reaction. br2 ( g. → br2 (l) ∆hf0 br2 ( g. = 30.91 kj/mol; ∆hf0 br2 (l) = 0 kj/mol)